基于GA的带终端约束的变结构末制导律设计

Design of variable structure terminal guidance law in posture restraint trajectory based on GA

巡航导弹对目标的杀伤力,除了精度要求(零脱靶量)外,还在于它的落角,尤其是打击纵深的目标时,垂直入射的价值很高。针对巡航导弹落角限制的要求,分别对纵向和侧向两个通道设计出了限制落角的变结构末制导律,可以使导弹在期望的方位以期望的落角打击目标。针对两通道的耦合造成的参数敏感性,采用遗传算法对变结构参数进行了优化,并将其与带终端约束的三维比例导引律进行了比较。仿真结果证明了该制导律在落角和精度方面的优势与有效性。

The lethality of cruise missiles is not only dependent on the precision （with miss distance as zero）, but also on the angle of fall. Based on constraints to angle-of-fall for cruise missiles, the variable structure terminal guidance law was designed for limiting the angle of fall in longitudinal and lateral directions. Thus the missile can be kept in desired azimuth and angle-of-fall for attacking the target efficiently. Considering the parameter sensitivity due to coupling of the two channels, GA algorithm was used for optimizing the variable structure parameters. Then the guidance law was compared with the 3-dimensional proportional guidance law with terminal constrains. Simulation result proved that the guidance law put forward here is good in angle-of-fall and precision.